K+N AirFilter low RPM Stumble
#1
K+N AirFilter low RPM Stumble
I have a stock SuperHawk and put a Stage one Dynojet kit in it and ran great. Then Bought a K+N air filter and followed all the instructions and then had a low RPM stumble. Tried leaner and richer needle postion, richened the mixture screws-all with no real change. Carberation is not clean 1000-4000 RPM then cleans up after that. Any one else have this problem? am I needing a richer pilot jet? Any help is appreciated thanks Jon
#6
I had the same issue -had to start over with the jetting starting with the main jet- I used the factory pro kit - took a lot of work and trying out the differant jets as per the instructions from factory pro - still working on the low end to fine tune it but the stumble and deceleration popping are all gone and the top end is way stronger.
#9
#10
#11
So while waiting for a new OEM air filter to come in I continued with the rejet...
Dynojet main 180 front 185 rear
Dynojet stage one needle 5th clip
slow jet #48
fuel screw out 2 1/2 turns
Stock exhaust
Bike still has a slight stumble around 3500 RPM but much more improved, anyone want to comment on next possible step(other than sell the K+N)?try #50 slow jet? adjust mixture screw? Needle?
Thanks Jon
PS. Great website here and thanks for the help, I just downloaded the Shop manual.
Dynojet main 180 front 185 rear
Dynojet stage one needle 5th clip
slow jet #48
fuel screw out 2 1/2 turns
Stock exhaust
Bike still has a slight stumble around 3500 RPM but much more improved, anyone want to comment on next possible step(other than sell the K+N)?try #50 slow jet? adjust mixture screw? Needle?
Thanks Jon
PS. Great website here and thanks for the help, I just downloaded the Shop manual.
#14
The #50 pilot jets were much too rich when I had the stock pipes and a K+N. I ended up with #48's, 1.5 turns out. There are a range of settings that work for VTR's but each bike seems to have its quirks. What helped me most was information from a guy who knew what he was doing when he had my bike on a dyno with an exhaust gas analyzer.
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Red_Liner740
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07-20-2008 12:51 AM